Ok, so first of all I take out all the wyverns and salamanders, and the other dragon. Then kick abazigal's ass so he turns into a dragon. I havent lost a party member and theyre all pretty much full health, so I HAMMER abazigal with 3 imp hasted fighters (PC lvl 30 bezerker, sola, and valygar with cf +5) they all have 10 or close to 10 attacks per round. Pretty soon he's near death, i hit him for a while and he wont die, then he buffets me away, i keep shooting him with my arrows and sling, so he doesnt get a chance to heal himself, then come back, beat him some more, he's still near death. I did this for a long time before finally giving up. EXTREMELY frustrating since it was such a good battle.
I have the following mods installed, all latest releases
Solaufien
Tactics
Tashia
Ease of Use
Valen
Ascension
Flirt Pack
Item Upgrade